'Today was the best I've played for a long, long time,' said Singh. 'Looking back, I'd like to play this way every day if I can. Not because I won, just because the way I struck the ball was really solid.'
Scott Hoch fired a 5-under 67 in the final round to finish alone in second place at 9-under-par 279. John Huston was one shot further back at 8-under-par 280.
After a rainy weekend with plenty of weather delays to go around pushed the completion of the third round into Monday morning, the clouds gave way at Redstone Golf Club for the final round.
Singh completed his third round Monday and joined Huston in the lead at 7 under par through 54 holes.
He wasn't given much time to rest before the final round began and Singh jumped out of the gate with a birdie at the par-5 first. He then birdied the par-3 third to assume the top spot at minus-9.
Singh added to his advantage at the par-4 11th after his approach stopped within eight feet of the hole. Singh drained the birdie putt to open a two-shot edge and kept plugging along down the stretch.
At the par-5 15th, Singh hit an errant second shot that hit a spectator in the stomach and ended up in the thick grass short of the putting surface. Singh chipped his third to nine feet and converted the birdie putt to move to 11 under.
Singh, who captured this event by six strokes in 2002, parred his three remaining holes to join Phil Mickelson as the only multiple winners on tour this season.
'Today I was so comfortable out there,' said Singh, who captured the Pebble Beach National Pro-Am in February.
The 41-year-old has now won each of the last two PGA Tour events that have finished on a Monday, the other being the John Deere Classic in 2003.
'Every time there's a rain delay that finishes on Monday, I think I win,' said Singh, who pocketed $900,000 for the victory. 'I think it's a blessing that it finished like this, but we had a great day today. It was unfortunate that we had such a bad weekend, but fortunately for me, we finished today.'
Hoch, who lost this event in a playoff to Payne Stewart in 1995, made an early run with birdies on each of his first three holes.
The 48-year-old added a birdie at the 12th and knocked his third shot inside five feet for a birdie at the 15th to briefly pull within one of the lead.
'Any time you play this well and finish second in the tournament, you've had to have played well, at least for me,' said Hoch. 'I'm looking forward to coming back.'
Dudley Hart drained a birdie putt at the last to join Stephen Ames in a tie for fourth at 6-under-par 282.
John Daly was in contention after four birdies on the front nine put him at 8 under par.
Daly struggled on the way in, however, with three bogeys over his last five holes for a round of 71 to finish at 5-under-par 283 along with Paul Azinger, Jose Coceres and Rory Sabbatini in a tie for sixth.
Geoff Ogilvy took 10th place alone at 4-under-par 284.